Check if String is excel format c#

My program allows me to paste an excel that was copyed and add to a listview. I would like to know how I can check if the String is really a copy from a excel file.I found this solution(c# : Excel : Determine if a string is a valid datasheet Range?) but its not working.

 String cp = Clipboard.GetText();
 string[] stringSeparators = new string[] { "\r\n" };
 string[] rows = cp.Split(stringSeparators, StringSplitOptions.None);
 for (int i = 0; i < rows.Length - 1; i++){
    ListViewItem tempT = new ListViewItem(rows[i].Split('\t'));
    listView.Items.Add(tempT);
 }

The solution in the link above suggests this function:

private bool IsRange(string refr) {
   try {
      Range(refr);
      return true;   // if no error occurred, refr is a valid range
   }
   catch {
      return false;   // not a valid range
   }
}

The erro says:

 'Microsoft.Office.Interop.Excel.Range' is a 'type' but is used like a 'variable'